Mammary prosthesis made of polyacrylamide hydrogel

ABSTRACT

The present invention relates to a mammary prosthesis made of polyacrylamide hydrogel. Said prosthesis include a shell which is made of medical high polymer elastic material, such as silicone, and said shell have a round curved surface. The shell is filled with polyacrylamide hydrogel, or with hydrogel powder, and the weight of the filled powder is matched with the volume of the circular shell, that is to say, each 100 ml volumes of the shell could be filled with about 2.5–5 g hydrogel powder.

FIELD OF THE INVENTION

The present invention relates to a medical plastic cosmetic surgerymaterial. More specifically, it relates to a kind of mammary prosthesisthat is used in plastic and cosmetic surgery.

BACKGROUND OF THE INVENTION

A mammary prosthesis made of liquid silicon or silicon gel had beenapplied to be implanted into the breasts in traditional plastic surgeryfor breasts. Although they felt good and enhanced breast beauty, thereexisted the problem of silicon leakage or spontaneous implant rapture.And the toxic silicon could induce breast granuloma and affect theimmunological functions of the body, and could be even carcinogenic. Inorder to solve these problems, saline, vegetable oil and protolysate arefilled into the mammary prosthesis. Although this can partially solvethe problem of toxicity and other complications, they do not feel asnatural as liquid silicon implants.

OBJECTS OF THE INVENTION

The object of the present invention is to provide a new type of mammaryprosthesis which can overcome the drawbacks mentioned above. The mammaryprosthesis feels good and guarantees safety, whether it is ruptured ornot.

SUMMARY OF THE INVENTION

The object of the present invention can be implemented by constructingmammary prosthesis made of polyacrylamide hydrogel, which comprising ashell 2 that is made of medical high polymer elastic material; saidshell 2 is filled with polyacrylamide hydrogel 4.

In the above mammary prosthesis, said medical high polymer elasticmaterial is silicone.

In the above mammary prosthesis, said polyacrylamide hydrogel 4 is madeby adding 2.5–7 g polyacrylamide dry powder into every 100 ml water.

In the above mammary prosthesis, the weight percentage of saidpolyacrylamide hydrogel 4 is: 2.5–8% acylamide, 0.001–3.0% cross-linkingagent, 0.001–4.00% catalyst, 0.001–2.00% accelerator, 0.001–2.00%facilitator and the other is sterile secondary distilled water.

In the above mammary prosthesis, said cross-linking agent isN,N′-methylenebisacrylamide and its homologous compound, orN,N′-diallyltartratdiamide; and said catalyst is ammonium persulfate orkalium persulfate; and said accelerator can be sodium bisulphate orsodium metasulphite; and said facilitators include triethanolamide,triethlamine or their N,N′ethylenediamine substances which containssubstituting groups.

In the above mammary prosthesis, said shell 2 has a round curvedsurface.

The objects of the present invention also can be achieved byconstructing a mammary prosthesis made of polyacrylamide hydrogel,comprising a shell 2 that is made of medical high polymer elasticmaterial; said shell 2 is filled with dry powder 3 of polyacrylamidehydrogel whose weight is matched with the value of the circular shell,that is to say, each 100 ml volumes of the shell could be filled with2.5–7 grams of said dry powder 3. Wherein said shell 2 has a non-returnvalve 1.

In the above mammary prosthesis, each 100 ml volumes of the shell 2could be filled with 4 grams of said dry powder 3.

In the above mammary prosthesis, said medical high polymer elasticmaterial is silicone.

In the above mammary prosthesis, said polyacrylamide hydrogel dry powderin weight comprises 2.5–8 units of acrylamide, 0.001–3.0 units ofcross-linking agent, 0.001–4 units of catalyst, 0.001–2.00 units ofaccelerator, 0.001–2.00 units of facilitator.

In the above mammary prosthesis, said cross-linking agent isN,N′-methylenebisacrylamide and its homologous compound, orN,N′-diallyltartratdiamide; and said catalyst is ammonium persulfate orkalium persulfate; and said accelerator can be sodium bisulphate orsodium metasulphite; and said facilitators include triethanolamide,triethlamine or their ethylenediamine substances which containssubstituting groups.

In the above mammary prosthesis, said shell 2 has a round curvedsurface.

In the above mammary prosthesis, said non-return valve 1 is located inthe center of one face of said round shell 2.

The mammary prosthesis made of polyacrylamide hydrogel of the presentinvention has the advantages of feeling true, convenience for use,non-toxicity after long-term, safety and without sequela, etc.

The present invention will be understood by reference to descriptiontaken in conjunction with accompanying drawing in which:

BRIEF DECRIPTION OF THE DRAWINGS

FIG. 1 is a side view of the mammary prosthesis made of polyacrylamidehydrogel in an embodiment of the present invention.

FIG. 2 is a front view of the mammary prosthesis made of polyacrylamidehydrogel in another embodiment of the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

As shown in FIG. 1, the mammary prosthesis made of polyacrylamidehydrogel of the present invention has an outer shell 2 which has a roundcurved surface. Said shell 2 is made of flexible silicon, and anon-return valve 1 is located in the center of one face of said shell 2.Said valve 1 is used for injecting saline into the prosthesis after itis implanted into the human body. Beforehand said shell 2 is filled withdry powder 3 of polyacrylamide hydrogel whose weight is matched with thevolume of said circular shell 2; for example each 100 ml volumes of theshell could be filled with 2.5–7 g (4 g preferably) of said dry powder3.

As shown in FIG. 2, in another embodiment of the present invention, theprepared polyacrylamide hydrogel 4 is filled in the shell beforehand.The shell 2 should have a round curved surface. And the shell needs nonon-return valve.

In the above embodiments, the polyacrylamide hydrogel is prepared in thefollowing way: take cross-linked acrylamide as the base, and diffuseproper amount of acrylamide, cross-linking agent, catalyst, acceleratorand facilitator into sterile secondary distilled water to polymerize,then the gel resulted from this kind of polymerization is washed, soakedand extracted, and finally medical gel of different cross-linkingdegrees and densities is prepared.

1. A mammary prosthesis made of polyacrylamide hydrogel, comprisingshell which is made of silicon, and polyacrylamide hydrogel filled insaid shell, said polyacrylamide hydrogel being prepared by adding 2.5–7grams of polyacrylamide dry powder into every 100 ml water, saidpolyacrylamide hydrogel dry powder comprising a weight percentage of2.5–8% acylamide, 0.001–3.0% cross-linking agent, 0.001–4.00% catalyst,0.001–2.00% accelerator, 0.001–2.00% facilitator are added intodistilled water to be 100% to be polymerized, then be washed, soaked,centrifugal dehydrated and dried.
 2. A mammary prosthesis as claimed inclaim 1 wherein said cross-linking agent is N, N′-methylenebisacrylamideand its homologous compound, or N, N′-diallyltartratdiamide.
 3. Amammary prosthesis as claimed in claim 1 wherein said shell has a roundcurved surface.
 4. A mammary prosthesis as claimed in claim 2 whereinsaid catalyst is ammonium persulfate or kalium persulfate.
 5. A mammaryprosthesis as claimed in claim 4 wherein said accelerator is sodiumbisulphate or sodium metasulphite.
 6. A mammary prosthesis as claimed inclaim 5 wherein said facilitators comprise triethanolamide, triethlamineor their N,N′ethylenediamine substances which contains substitutinggroups.
 7. A mammary prosthesis made of polyacrylamide hydrogel whereinit comprises a shell that is made of silicon and has a non-return valve,and said shell comprises dry powder of polyacrylamide hydrogel whoseweight is proportional to the volume (ml) of said shell; wherein 2.5–7grams of said dry powder of polyacrylamide hydrogel is added to every100 ml volume of said shell, and said dry powder comprises a weightpercentage of 2.5–8% acylamide, 0.001–3.0% cross-linking agent,0.001–4.00% catalyst, 0.001–2.00% accelerator, 0.001–2.00% facilitatorare added into distilled water to be 100% polymerized, then washed,soaked, centrifugal dehydrated and dried.
 8. A mammary prosthesis asclaimed in claim 7 wherein 4 grams of said dry powder is added to every100 ml volume of said shell.
 9. A mammary prosthesis as claimed in claim8 wherein said cross-linking agent is N,N′-methylenebisacrylamide andits homologous compound, or N,N′-diallyltartratdiamide.
 10. A mammaryprosthesis as claimed in claim 9 wherein said catalyst is ammoniumpersulfate or kalium persulfate.
 11. A mammary prosthesis as claimed inclaim 10 wherein said accelerator is sodium bisulphate or sodiummetasulphite.
 12. A mammary prosthesis as claimed in claim 11 whereinsaid facilitators comprise triethanolamide, triethlamine or theirN,N′ethylenediamine substances which contains substituting groups.
 13. Amammary prosthesis as claimed in claim 7 wherein said shell has a roundcurved surface.
 14. A mammary prosthesis as claimed in claim 7 whereinsaid non-return valve is located in the center of one face of saidshell.